The VpnAdapter property attempts to
detect if the system is currently using a Virtual Private Network (VPN)
connection. The detection logic is based on identifying active network
adapters with names or descriptions that match known VPN software or
common VPN adapter naming conventions, while explicitly excluding adapters
associated with virtualization platforms (such as Hyper-V, VMware, and VirtualBox),
loopback interfaces, and other non-VPN virtual adapters.
Because there is no industry standard for how VPN clients are identified
at the network adapter level, this function uses a heuristic approach and
cannot guarantee detection in every scenario. Some VPN clients may use
custom adapter names or attempt to obscure their presence, and new VPN
software may not be recognized until the internal detection list is updated.
There is also a small chance that non-VPN software using similar naming
conventions could result in a false positive.
The value of this property should be treated as a hint for diagnostic
or troubleshooting purposes. It should not be used to restrict access to
your application or deny service to users based solely on the possible
presence of a VPN connection. If you wish to determine the IP address
assigned to the VPN adapter, check the value of the VpnAddress
property.
If no active VPN adapter is detected, this property will return an
empty string.